Novel cationic surfactants for corrosion inhibition of carbon steel pipelines in oil and gas wells applications

• Published in: Journal of molecular liquids Vol. 214; pp. 347 - 356
• Main Authors: Hegazy, M.A., El-Etre, A.Y., El-Shafaie, M., Berry, K.M.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.02.2016
• Subjects: Cationic surfactants; Corrosion inhibitor; Surface activity; Synthesis; Synthesis; Surface activity; Cationic surfactants; Corrosion inhibitor
• ISSN: 0167-7322; 1873-3166
• DOI: 10.1016/j.molliq.2015.11.047

A novel series of cationic surfactants namely: 1-dodecyl-2-(phenethylimino)-1-methylpyrrolidin-1-ium bromide (A), 1-dodecyl-2-((2-hydroxyethyl)imino)-1-methylpyrrolidin-1-ium bromide (B) and 1-dodecyl-2-((4-hydroxyphenyl)imino)-1-methylpyrrolidin-1-ium bromide (C), were evaluated as corrosion inhibitors for carbon steel pipelines in oil and gas wells applications by weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. Surface parameters of the cationic surfactants were determined using surface tension and conductivity techniques. The results of the surface tension measurements showed good surface behavior of these compounds in their aqueous solutions. The prepared cationic surfactants showed a good ability to act as corrosion inhibitors for the tested system. It was found that the inhibition efficiency increases by increasing the inhibitor concentration, exposure time and temperature. Inhibition efficiency of three cationic surfactants follows the order: C>A>B. •Three novel corrosion inhibitors for carbon steel in oil and gas well applications.•The efficiency of the inhibitors increases by increasing the inhibitor concentration.•Double layer capacitance decreases with increasing the inhibitor concentration.•Inhibitors act as mixed-type inhibitor and their adsorption obeys Langmuir isotherm.